Yes, we have a 44 ft 5th wheel with dually truck and we fit. You just have to make sure to pick a site that's big enough, not all sites would fit that size, but many would.

I was there in May 2022 and I saw much bigger rigs there. Most would park their toads parallel to the road, in front or behind their rig. There is enough space to navigate through the campground at that size as well, but you best disconnect prior to entering the campground. Be mindful of the size of site you pick and you'll be fine.

I'd call Colter Bay to confirm. If you don't have reservations already, may be hard to get a site.